A GNSS control system and method are provided for guiding, navigating and controlling a motive component, such as a tractor, and a working component, such as an implement. A vector position/heading sensor is mounted on the motive component and includes multiple antennas connected to a GNSS receiver....http://www.google.com.hk/patents/US7885745?utm_source=gb-gplus-share專利 US7885745 - GNSS control system and method
